Vaccum ejector(aspirator)_for Lab use

Vaccum ejector is the tool which can make negative pressure using Bernoulli's principle;The venturi effect.
You can plug the most wide part to Tap water and connect some rubber silicon tube into small branch part to make vaccum or Suction, agricultural purpose mixing.
Its degree of vacuum is still low comparing commercial vaccum ejector and I suppose the reason is its structure.
I'll modify and test it later.